package com.example.picdiy;


import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.ImageView;

public class ColorView extends ImageView {

	private Paint myPaint = null;
	private Bitmap bitmap = null;
	private int width,height;
	private int[] oldPixels;  
    private int[] newPixels;  
    private int color,color2;
    private int pixelsR,pixelsG,pixelsB,pixelsA,pixelsR2,pixelsG2,pixelsB2;
    
    int drawType = 0;
    
	public ColorView(Context context, AttributeSet attrs)
	{
		super(context, attrs);
		bitmap = BitmapFactory.decodeResource(context.getResources(),R.drawable.pic); 
		width = bitmap.getWidth();  
        height = bitmap.getHeight();
        oldPixels = new int[width*height]; 
        newPixels = new int[width*height];
        invalidate();
	}
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas); 
       switch (drawType) {
	case Constant.INVERT:
		Invert(canvas);
		break;
	case Constant.EMBOSS:
		emboss(canvas);
		break;

	default:
		break;
	}
	}
	
	
	
	public void setDrawType(int drawType) {
		this.drawType = drawType;
	}
	
	/**
	 * 底片效果 
	 */
	private void Invert(Canvas canvas) {
		 //获取像素
        bitmap.getPixels(oldPixels, 0, width, 0, 0, width, height);
        
        for(int i = 1;i < height*width; i++){
        		color = oldPixels[i];
        		//获取RGB分量
        		pixelsA = Color.alpha(color);
        		pixelsR = Color.red(color);
        		pixelsG = Color.green(color);
        		pixelsB = Color.blue(color);
        		
        		//转换
        		pixelsR = (255 - pixelsR);
        		pixelsG = (255 - pixelsG);
        		pixelsB = (255 - pixelsB);
        		//均小于等于255大于等于0
        		if(pixelsR > 255){
        			pixelsR = 255;
        		}
        		else if(pixelsR < 0){
        			pixelsR = 0;
        		}
        		if(pixelsG > 255){
        			pixelsG = 255;
        		}
        		else if(pixelsG < 0){ 
        			pixelsG = 0;
        		}
        		if(pixelsB > 255){
        			pixelsB = 255;
        		}
        		else if(pixelsB < 0){
        			pixelsB = 0;
        		}
        		//根据新的RGB生成新像素
        		newPixels[i] = Color.argb(pixelsA, pixelsR, pixelsG, pixelsB);
        		
        }
        //根据新像素生成新图片
        bitmap.setPixels(newPixels, 0, width, 0, 0, width, height);
		canvas.drawBitmap(bitmap,0,0,myPaint);
	}
	/**
	 * 浮雕效果
	 */
	private void emboss(Canvas canvas) {
		 //获取像素  
        bitmap.getPixels(oldPixels, 0, width, 0, 0, width, height);  
          
        for(int i = 1;i < height*width; i++){  
                color = oldPixels[i-1];  
                //前一个像素  
                pixelsR = Color.red(color);  
                pixelsG = Color.green(color);  
                pixelsB = Color.blue(color);  
                //当前像素  
                color2 = oldPixels[i];  
                pixelsR2 = Color.red(color2);  
                pixelsG2 = Color.green(color2);  
                pixelsB2 = Color.blue(color2);  
                  
                pixelsR = (pixelsR - pixelsR2 + 127);  
                pixelsG = (pixelsG - pixelsG2 + 127);  
                pixelsB = (pixelsB - pixelsB2 + 127);  
                //均小于等于255  
                if(pixelsR > 255){  
                    pixelsR = 255;  
                }  
                  
                if(pixelsG > 255){  
                    pixelsG = 255;  
                }  
                  
                if(pixelsB > 255){  
                    pixelsB = 255;  
                }  
                  
                newPixels[i] = Color.argb(pixelsA, pixelsR, pixelsG, pixelsB);  
                  
        }  
        bitmap.setPixels(newPixels, 0, width, 0, 0, width, height);  
        canvas.drawBitmap(bitmap,0,0,myPaint);  
	}
}

